“We’re really saying two things at once: that there’s evidence the typical black hole solutions don’t work for you on a long, long timescale, and we have the first proposed astrophysical source for dark energy,” said Duncan Farrah, University of Hawaii astronomer and lead author on both papers. With singularities removed, the paper then shows that the combined vacuum energy of black holes produced in the deaths of the universe’s first stars agrees with the measured quantity of dark energy in our universe. According to the second paper, the growth in mass of these black holes matches predictions for black holes that not only cosmologically couple, but also enclose vacuum energy-material that results from squeezing matter as much as possible without breaking Einstein’s equations, thus avoiding a singularity. The first study found that these black holes gain mass over billions of years in a way that can’t easily be explained by standard galaxy and black hole processes, such as mergers or accretion of gas. Their findings are published in two journal articles, one in The Astrophysical Journal and the other in The Astrophysical Journal Letters. Gregory Tarlé, U-M professor of physics, and researchers from the University of Hawaii and other institutions across nine countries studied supermassive black holes at the heart of ancient and dormant galaxies to develop a description of them that agrees with observations from the past decade.
Searching through existing data spanning 9 billion years, a University of Michigan physicist and colleagues have uncovered the first evidence of “cosmological coupling”-a newly predicted phenomenon in Einstein’s theory of gravity, possible only when black holes are placed inside an evolving universe. 2 in The Astrophysical Journal Letters: Observational Evidence for Cosmological Coupling of Black Holes and Its Implications for an Astrophysical Source of Dark Energy
1 in The Astrophysical Journal: A Preferential Growth Channel for Supermassive Black Holes in Elliptical Galaxies at z ≲ 2 Others found the solar sound relatable, or appropriate as Halloween approaches.ĭistributed by Tribune Content Agency, LLC.Study No. The audio clip NASA tweeted this week has garnered over 14 million views as of Tuesday afternoon, with most social media users agreeing the audio is pretty spooky. The galaxy cluster Perseus is about 240 million light-years away from Earth. That means the sound isn't exactly what you would hear if you were close to the black hole-and if humans were able to hear this kind of sound. The signals "are being heard 144 quadrillion and 288 quadrillion times higher than their original frequency," NASA added. "This is because astronomers discovered that pressure waves sent out by the black hole caused ripples in the cluster's hot gas that could be translated into a note-one that humans cannot hear some 57 octaves below middle C," NASA confirmed in a news release. NASA initially released the so-called "sonification" earlier this year, explaining that researchers have "associated" the black hole in the Perseus galaxy cluster with sound since 2003.
Credit: NASA You wouldn't be able to hear what a black hole really sounds like
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